Re: [ServiceWorker] Soft Update and Register can race when setting registration scriptURL (#789)

Yea, I'm going to implement this change.  Instead of:

```
6. Set registration's registering script url to newestWorker's script url.
```

Instead do:

```
6. If newestWorker's script url does not equal registration's registering script url, abort
    these steps.
```

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https://github.com/slightlyoff/ServiceWorker/issues/789#issuecomment-158793500